L293D is a typical Motor driver or Motor Driver IC which allows DC motor to drive on either direction. L293D is a 16-pin IC which can control a set of two DC motors simultaneously in any direction. It means that you can control two DC motor with a single L293D IC.In a single L293D chip there are two h-Bridge circuit inside the IC which can rotate two dc motor independently.H-bridge is a circuit which allows the voltage to be flown in either direction.H-bridge IC are ideal for driving a DC motor.Due its size it is very much used in robotic application for controlling DC motors

Big terminal block connectors to easily hook up wires (18-26AWG) and power

two-pin terminal block and jumper to connect external power, for separate logic/motor supplies

two connections for 5V ‘hobby’ servos connected to the Arduino’s high-resolution dedicated timer

Can run motors on 4.5VDC to 25VDC.

Up to 4 bi-directional DC motors with individual 8-bit speed selection (so, about 0.5% resolution)

Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil or interleaved stepping.

Pull down resistors keep motors disabled during power-up

four H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak) with thermal shutdown protection, internal kickback protection diodes.